Duplicates Hotkey entries in Preference window?
This looks like an addon problem to me. For &#8679; ShiftQ you have entries for call menu and call pie menu. I would say you have multiple addons adding the same shortcuts, or you have more than one copy of the same addon with different filenames. It could also be an addon that does not unregister itself properly leaving the shortcuts behind after you disable it.

An install of blender includes an addons folder that contains the official addons, then there are 3 places blender looks for data files, You could have a scripts/addons and scripts/addons_contrib in each location that can contain the same addon, if the same addon uses the same filename you will get an error saying you have duplicates, but it is possible to have the same addon saved with different filnames that can register without error and create the duplicate shortcut entries.

Expanding your duplicate keyboard entries will show the operator/menu name used by the duplicate which can give you some idea as to what addons are causing the problem. If the addon is not obvious by the name, the operator or menu name used for the shortcut can be used to search through files in the above directories to find where it originated.



If the name is two words separated by a . then this should match the bl_idname of the class used -

class CLIP_PIE_marker_pie(Menu):
    # Settings for the individual markers
    bl_label = "Marker Settings"
    bl_idname = "clip.marker_pie"


If you get a name like CLIP_PIE_marker_pie then it may match the class name or only part of it (the later part most likely) in the file. This is also an indication that the addon has been disabled but has not cleaned up it's keyboard shortcuts.

After finding and removing any duplicates you may also need to disable duplicate addons and remove duplicate shortcut entries, then "Save User Settings" so they stay disabled next time you start blender. You could also use File->Load Factory Settings, re-add your personal adjustments and then Save User Settings to get a clean start.